2IO 



A CONTINUOUS RECORD OF ATMOSPHERIC NUCLEATION. 



on April 27 and 28 is again high in nucleation and here there is a reversal of 

 the winter temperature effect, both in the high maximum of April 21 (which 

 conies too late) and the minimum of April 27 (which is also too late). In rela- 

 tion to temperature, both regions have been shifted to the right. The rise of 

 nucleation during the rain of the 2Qth may be pointed out. There are many 

 results during the month which seem to imply a change of nucleation with the 

 direction of the wind. 



"A I 



t^-o, 



SJ 27 23T 



SO 



43 



./ 



7C 



'\J 



78' 



81' 



4;' 



7S 1 



CHARTS 44, 45, 46, 47, 48. 



21. May (charts 42, 43, 44) also begins with a period of high nucleations, 

 reaching from May 2 to the rain of May 9. The temperature effect is usually 

 reversed or obscure. The contrast with the low nucleation of the preceding 

 year is marked. Rain minima as a whole are low. Strong nucleations (as was 

 the case in April) mark the close of the month. 



22. June (charts 44, 45, 46) at last introduces the characteristic summer 

 nucleation, during the first half of the month. The temperature effect is re- 

 versed. Sunday nucleations are low on June 5, 12, but not on June 19, which 

 shows phenomenally high values. Abrupt high maxima occur on June 14 and 

 1 6. On the i7th there is change of nucleation with the direction of the wind. 

 One may note the sharp reduction of nucleation due to the thunder-storm of 

 June 26. After June 20 the values are as a whole seasonable. 



